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Post-Employment Benefits - Summary of Asset Allocation by Asset Type and Geography (Detail) - SEK (kr) kr in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Disclosure of fair value of plan assets [line items] |  |
Cash and cash equivalents | kr 2,034 | kr 1,266
Equity securities | 11,822 | 10,314
Debt securities | 28,446 | 32,892
Real estate | 6,276 | 6,005
Investment funds | 5,359 | 7,025
Assets held by insurance company | 9,911 | 4,116
Other | 511 | 975
Fair value of plan assets | kr 64,359 | kr 62,593
Investment funds [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Investment funds (percentage) | 68.00% | 69.00%
Cash and cash equivalents [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Cash and cash equivalents (percentage) | 15.00% | 22.00%
Equity securities [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Equity securities (percentage) | 24.00% | 27.00%
Debt securities [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Debt securities (percentage) | 26.00% | 21.00%
Real estate [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Real estate (percentage) | 100.00% | 100.00%
Assets held by insurance company [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Assets held by insurance company (percentage) | 100.00% | 100.00%
Other [Member] |  |
Disclosure of fair value of plan assets [line items] |  |
Other (percentage) | 1.00% | 38.00%
Owner occupied property measured using investment property fair value model [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Real estate (percentage) | 0.00% | 0.00%
Securities issued [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Assets held by insurance company (percentage) | 0.00% | 0.00%
Sweden [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Cash and cash equivalents | kr 231 | kr 271
Equity securities | 8,557 | 7,311
Debt securities | 14,559 | 14,335
Real estate | 5,760 | 5,461
Investment funds | 2,139 | 2,016
Assets held by insurance company | 0 | 0
Other | (55) | 233
Fair value of plan assets | kr 31,191 | kr 29,627
Sweden [member] | Owner occupied property measured using investment property fair value model [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Real estate (percentage) | 0.00% | 0.00%
Sweden [member] | Securities issued [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Assets held by insurance company (percentage) | 0.00% | 0.00%
US [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Cash and cash equivalents | kr 206 | kr 181
Equity securities | 431 | 361
Debt securities | 4,052 | 3,591
Real estate | 0 | 0
Investment funds | 792 | 834
Assets held by insurance company | 0 | 0
Other | (328) | (152)
Fair value of plan assets | kr 5,153 | kr 4,815
US [member] | Owner occupied property measured using investment property fair value model [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Real estate (percentage) | 0.00% | 0.00%
US [member] | Securities issued [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Assets held by insurance company (percentage) | 0.00% | 0.00%
United Kingdom [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Cash and cash equivalents | kr 1,025 | kr 681
Equity securities | 914 | 769
Debt securities | 118 | 5,681
Real estate | 0 | 0
Investment funds | 308 | 2,346
Assets held by insurance company | 8,002 | 2,437
Other | 828 | 496
Fair value of plan assets | kr 11,195 | kr 12,410
United Kingdom [member] | Owner occupied property measured using investment property fair value model [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Real estate (percentage) | 0.00% | 0.00%
United Kingdom [member] | Securities issued [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Assets held by insurance company (percentage) | 0.00% | 0.00%
Other Countries [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Cash and cash equivalents | kr 572 | kr 133
Equity securities | 1,920 | 1,873
Debt securities | 9,717 | 9,285
Real estate | 516 | 544
Investment funds | 2,120 | 1,829
Assets held by insurance company | 1,909 | 1,679
Other | 66 | 398
Fair value of plan assets | kr 16,820 | kr 15,741
Other Countries [member] | Owner occupied property measured using investment property fair value model [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Real estate (percentage) | 0.00% | 0.00%
Other Countries [member] | Securities issued [member] |  |
Disclosure of fair value of plan assets [line items] |  |
Assets held by insurance company (percentage) | 0.00% | 0.00%

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